Aurifil 100% cotton 12 wt thread is ideal for hand quilting, big stitch hand quilting, and machine quilting. 12 weight thread creates a more defined and often primitive look. It's great for designs that use a longer stitch length if using a machine. When machine quilting with 12 wt thread, use Aurifil cotton 40 wt in the bobbin, increase your stitch length, lower your tension, use Topstitch size 90 needles and stitch slowly.